No, fm, unfortunately he didn't and I couldn't really argue about the sudden change in water conditions since he'd been talking about a completely different shrimp.
Am putting it down to the betta being in the tank going into "Jaws" mode and stalking them before the 1st one disappeared, not sure what happened to the 2nd one other than I saw it being swallowed by an assassin snail. The tank they are/were in is a mature tank, in fact it was the first one I had so there should have been plenty algae and uneaten food particles to keep them going. Also have been sprinkling a little crushed flake in there since they didn't seem to like the shrimp pellets!
Have ordered 3 more and will put them all in the micro tank when they arrive (4 in total all being well).
Will then rearrange the tanks' occupants back to where they were before with the exception of the amanos all going in the platy tank, the betta will be returned to the 30L along with the zebra snails.